Criticism is not all that easy. If you have been through any kind of management training you will probably have done a number of sessions on giving “constructive feedback” or something like that. The trick to remember is that we want to achieve an effect. We want to change the person we are giving the feedback to. Does criticizing make that happen for you? No, there is no such thing as constructive criticism.
What can you do instead? Try giving yourself, your colleagues, your customers and whom ever else you meet professionally positive feedback. No one is so bad that there is nothing you can appreciate about them. Tell them about it. Most people don’t so your opinion will be all the more welcome.